Promethium-153

Properties and data of the isotope ¹⁵³Pm.

Content

General data

Name of the isotope:Promethium-153; Pm-153Symbol:¹⁵³Pm or 15361PmMass number A:153 (= number of nucleons)Atomic number Z:61 (= number of protons)Neutrons N:92Isotopic mass:152.924156(10) u (atomic weight of Promethium-153)Nuclide mass:152.8906952 u (calculated nuclear mass without electrons)Mass excess:-70.64823 MeVMass defect:1.350343224 u (per nucleus)Nuclear binding energy:1257.8366111 MeV (per nucleus)
8.22115432 MeV (average binding energy per nucleon)Separation energy:S_N = 7.465(27) MeV (first neutron)
S_P = 7.787(26) MeV (first proton)Half-life:5.25(2) minDecay constant λ:0.0022004672398728 s^-1Specific activity α:8.718107681704 × 10⁺¹⁸ Bq g^-1
235624531.93795 Ci g^-1Spin and parity:
(nuclear angular momentum)5/2-Year of discovery:1962

Radioactive Decay

Half-life T_½ = 5.25(2) min (minutes) respectively 3.15 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁵³Sm	100 %	1.912(9) MeV

Parent Nuclides

Direct parent isotope is: ¹⁵³Nd.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 92) and isobaric (same nucleon number A = 153) with Promethium-153. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 92	Isobar A = 153
53	¹⁴⁵I
54	¹⁴⁶Xe
55	¹⁴⁷Cs
56	¹⁴⁸Ba	¹⁵³Ba
57	¹⁴⁹La	¹⁵³La
58	¹⁵⁰Ce	¹⁵³Ce
59	¹⁵¹Pr	¹⁵³Pr
60	¹⁵²Nd	¹⁵³Nd
61	¹⁵³Pm	¹⁵³Pm
62	¹⁵⁴Sm	¹⁵³Sm
63	¹⁵⁵Eu	¹⁵³Eu
64	¹⁵⁶Gd	¹⁵³Gd
65	¹⁵⁷Tb	¹⁵³Tb
66	¹⁵⁸Dy	¹⁵³Dy
67	¹⁵⁹Ho	¹⁵³Ho
68	¹⁶⁰Er	¹⁵³Er
69	¹⁶¹Tm	¹⁵³Tm
70	¹⁶²Yb	¹⁵³Yb
71	¹⁶³Lu	¹⁵³Lu
72	¹⁶⁴Hf	¹⁵³Hf
73	¹⁶⁵Ta
74	¹⁶⁶W
75	¹⁶⁷Re
76	¹⁶⁸Os
77	¹⁶⁹Ir
78	¹⁷⁰Pt
79	¹⁷¹Au
80	¹⁷²Hg